Cov lus qhia hauv qab no yog txhua yam hais txog tus dev underwater treadmill , los ntawm cov khoom muaj feem xyuam no, koj tuaj yeem tau txais cov ntaub ntawv tseem ceeb, sau ntawv hauv kev siv, lossis cov ncauj lus tshiab txog tus dev underwater treadmill . Peb vam tias cov xov xwm no yuav muab kev pab koj xav tau. Thiab yog tias cov dev no underwater treadmill cov khoom tuaj yeem daws tsis tau koj cov kev xav tau, koj tuaj yeem tiv tauj peb rau cov ntaub ntawv tseem ceeb.